I just found this bad error handling in the WrappedCallableStatement:

public byte getByte(String parameterName) throws SQLException
{
try

{ return cs.getByte(parameterName); }
catch (SQLException e)
{ checkException(e); return 0; }
}

The idea is supposed to be that checkException looks for fatal errors and closes the exception
before given the exception to the application:

This needs making more explicit to avoid errors:

public byte getByte(String parameterName) throws SQLException
{
try
{ return cs.getByte(parameterName); }

catch (SQLException e)

{ throw checkException(e); }

}